Q: A customer has asked whether we can supply carbon and alloy steel valve bodies meeting Supplemental Requirement S23 in ASTM A What is the. fication, shall apply to steel castings for pressure-containing Specification A and SI units for material ordered to parts under each of the following ASTM. Buy ASTM A /AM: SPECIFICATION FOR STEEL CASTINGS, GENERAL REQUIREMENTS, FOR PRESSURE-CONTAINING.
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Work Item s – proposed revisions of this standard. The specifications for the common cast steels used in valve bodies do not require analysis or reporting of nitrogen as a standard requirement.
Admiral Valve Announces Partnership with Diek. Although some foundries monitor nitrogen levels in their steel, many do not have the necessary equipment to do this. Steel Castings, Martensitic Stainless and Alloy, for.
Stainless Steel, for Pressure-Containing Parts.
Link to Active This link will always route to the current Active version of the standard. If fracture occurs, it has a rock-candy appearance due to fracture along the prior austenite grain boundaries.
a7703 Despite Oil Prices Post: Texas Manufacturing Expands Modestly, Outlook. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
This abstract is a brief summary of the referenced standard. E Reference Radiographs for Heavy-Walled to 12 in. When the metal is poured into the casting mold, the oxygen can come out of the solution and form gas porosity in the castings. Aastm Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Looking for a career in the Valve Industry? Castings, Austenitic, for Pressure-Containing. The macroetch test specified in Supplemental Requirement S23 in ASTM A is designed to detect the occurrence of aluminum nitride embrittlement in castings. Monitoring Pressure Relief Devices Post: The steel shall be made by open-hearth or electric-furnace process, with or a7033 separate refining such as argon-oxygen-decarburization AODunless otherwise designated by the individual specification.
Supplemental Requirement S23 in ASTM A
The mold material can also influence the cooling rate. Ferritic and martensitic steel shall be cooled after pouring to provide substantially complete transformation of austenite prior to heat treatment to enhance mechanical properties.
The Adventures of Duke Waters. The presence of these elements results in the formation of oxide compounds, which mitigates the formation of oxygen gas bubbles during solidification.
In order to avoid castings with excessive gas porosity, the foundry may add deoxidizing elements to the melt. Test coupons shall be cast from the same heat as the castings represented, except that for investment castings, the test coupons shall be cast in the same type of mold as the castings.
An analysis of each heat shall be made by the manufacturer to determine the percentages of the elements specified. Combining values from the two systems may result in nonconformance with the standard.
Containing Parts, Suitable for Low-Temperature. Pressure-Containing Parts, Suitable for High. ViewIn Technology for Mechanical Seals. Emerson Completes Acquisition of iSolutions Inc. These are provided for use when additional testing or inspection is desired and apply only when specified individually by the purchaser in the order.
Shale Work Up in U. Therefore, the nitrogen content of the steel is often not known or reported, and it is possible that enough nitrogen is present to form aluminum nitride.
Satm example, air-set sand is known to inherently produce molds that cool slower than green-sand molds.
A complex casting with relatively thin walls may experience slower cooling rates than a simple casting with the same wall thickness because the complex casting will lose heat through the mold less effectively. One tension test shall be made from each heat, and shall conform to the tensile requirements specified.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. New Products Prev Next Rotork: New Washer Application Search Tool. Upcoming Valve Industry Events Reprints. Emerson Completes Acquisition of iSolutions I.
Historical Version s – view previous versions of standard.
Standard Specification for Steel Castings, General Requirements, for Pressure-Containing Parts
What is the purpose of this requirement? Custom Hydraulic Power Units.
The fracture is often very shiny due to the presence of aluminum nitride platelets on the surface. When steel is melted, oxygen and nitrogen can be dissolved in the molten aastm.
Most foundries have the equipment necessary to awtm and report aluminum content. The resulting etched specimen is compared with 10 reference macrographs. Variables That Influence Embrittlement There are a number of variables that influence the potential for this type of embrittlement: Steel Castings, Ferritic and Martensitic, for Pressure.
Rigging and Lifting of Large Valves Post: Certain elements are known to inhibit the formationof aluminum nitride. The mechanical test methods and definitions are presented in details.